Smoke-consuming furnace.



E. LANE.

SMOKE CONSUMING FURNACE.

APPLICATION FILED IAN.3. 1910.

1 ,162,736. y Patented Nov. 30, 1915.

4 SHEETS-SHEET l.

E. LANE.

l SMOKE CONSUMING FURNACE.

APPLICATION FILED JAN.3,1910. 1,162,736. Patented Nov. 30, 1915.

4 SHEETS-SHEET 2.

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' Nf L fy/l imaxes gb jaw/dbf@ E. LANE.

` SMOKE CONSUMING FURNACE.

Patented Nov. 30, 1915.

4 SHEETS-SHEET 3V- O. m ..m N. A J D E L H N o U A c U DI DI A 6 o0 7 Il ,2 6. 1 .l 1

fi it BIA PLANoaR/PH E. LANE.

SMOKE GONSUMING FURNACE.

APPLlcATloN FILED JAN. 3. 1910.

1,1 62973. Patented N0v..30, 1915.

4 SHEETS-SHEET 4.

coLUMBIA PLANOGRAPH co.. WASHINGTON. D. c.

narran sns naar ernten.

EDWARD lzA1|'Ef,` OF PITTSBURGH, PENNSYLVANIA.

SMOKCONSUMING FURNACE.

Specification of Letters Patent.

Patent-ea new. so, isis.

@riginal application leclctober 4, 1909, Serial No. 520,786. Divided and this application filed January 3,

1910. Serial No. 535,953.

To all whom t may Gomera'.` y

Be it known that I, EDWARD LANE, a citizen of the United States, residing at Pitts-l burgh, in the county of Alleghenyand State of Pennsylvania, have invented certain new and useful Improvements inn Smoke-Consumingg Furnaces, of which the following is specification` Thisis a division of my prior application, Serial No. 520,786, filedOctober, 1909.

My invention relates to furnaces of that kind in which means are provided for supplying' heated air throughthe .bridge wall to the burning fuel on the grate in front of said wall. i

Generally stated, the object of my vpresent invention, as herein shown and described and claimed, is to provide a novel and improved construction tendina` to solve many of the problems involved in the supplying of heated air to the burning` fuelr in this particular manner. v

More specifically considered, the object of my invention is to provide a simple and improved arrangement of the pipes by which the air is heated and supplied to the bridge wall, and of the means for supporting the outer or intake ends ofsaid pipes; and also to provide an efficient and improved conn struction of the bridge wall; and in addition it is also anv object to provide certain details and. features of construction and ccmbina tions tending to increase the general eili- `ciency and serviceability o-fa furnace having` air heating,` and supplying means lof this particular character.

To, these and 'other useful ends, as will hereinafter more fully appear, and as will be apparent to those skilled in the art, my invention consists in matters hereinafter` set forth and claimed, and shown in the accompanyingdrawings, vin Whichi Figure 1, is a central vertical longitudinal section of the rear portion of a boiler furnace embodying my invention. Fig. 2,

is a vertical transverse section of the furnace to disclose the front end of that part of the structure shown by Fig. 1. Fig. 3, is a horizontal section taken on the line lll-Hl of y Fig. 2. Fig. 4, is a sectional perspective view to disclose more clearly the bridge-wall construction. Fig. 5, is a detail perspective view of one of the'sleeves for receiving the rear end of one of aser'ies of the air-feeding pipes. Fig. 6, is an enlarged view .of

nace. preferably in the form ofa cross-bar 14 and parallels the bricks 10, and said cross-bar the rear'end of the furnaceto disclose the construction and arrangement of the correpending,- endlof one of the sleeves and the p ipe therein. Fig. 7, is a section on the line VII- VII of Fig. 6 and includes a valve-controlled plug, not shown in the lastnamed ligure. F 8, is a central vertical section of a modified` construction of the y bridge-wall of the furnace. Fig. 9, is a. sec- -tion- 0n the line IFI-JX of Fig. 8.

Fi@ 10, is a vertical section on afreduced scali, of a second modified form of the bridge wall, and also shows one of the pipes for supplying air thereto, equipped with an enlargement or collar to seal the hole in the bridge-wall through which said pipe eX- tends, when the pipe is elongated by eXpan sion.

Y shown, to overhang the rear part of the ash pit, and forming a support for `the overhanging` portion of the bridge-wall and the rear end of the grate, is an angle bar 8. The bridgewall is also formed with a vertical column of bricks 9 and at opposite side-s of said column,

with inclined bricks l0 sloping downward and forward and forming the lower part of the-mouth of a transverse hot-air chamber `11 in the bridge-wall, the rear wall of said Vchamber being` formed `by a casting 12 extending from side wall to side wall and having' enlarged triangular upwardly-projecting' extensionsl (see Fig. a) embedded at their side edges in the side walls of the fur- The top of the mouth of chamber 11 is 14 is provided with depending ribs 15, which taper from their lower outer corners which rest upon the `outermost of the bricks 10 formingVV the bottoml of the mouth of chamber 11, toward the column 9, at which point they merge into the bottom of bar 14. (See Fig. fl). By this arrangement it will be seen that, what may be termed, the throat of the mouth grows narrower from column 9 to p kthe sidewalls of the furnace and thus tends to discharge the greater volume of'hot air from chamber 11 into the middle portion of the furnace. Y Y

16 indicates-triangular plates secured at their outer edges in the side walls and stepped at their lower edges upon the rear edge of vthe bar 1st forming the top of the mouth of the chamber 11, said triangular plates 16 paralleling the triangular eXtensions 13 of casting 12 and being spaced forward thereof, and projecting rearwardly from the upper or hypotenuse edges of plates 16, are flanges 17 which lit at their rear edges in grooves 18 in said extensions 13 and thus form the top of the enlarged ends of chamber 11. A plate 19 bridges the space betweenthe lower ends of flanges 17 and the upper edges of the central portions of crosslbar 14 and casting 12 to form the top of the central or smaller portion of said chamber 11, it being noticed in F ig. 4f, that A ithe casting 12 is preferably in two sections,

one only being shown, adapted to be stepjointed and bolted together and that said sections are supported upon the rear portionof the bridge wall, it being also understood in this connection that by reason of the fact that the chamber 11 is larger at its ends than at-its middle as hereinbefore suggested, but that as its throat near the'middle is of greater area than at its ends, the

Vtendency of the hot air in the ends of said chamber is to be forced toward its center and pass, under pressure, through the throat and mouth into the central portion of the furnace and thus tend to act as a blast on the fuel on the grate and efecta combustion sufliciently fierce to consume the smoke and combustible gases or products of combustion which arise from the coking fuel on the grate.

To protect the preferably metal portions of the bridgewall from the intense heat of the furnace, bricks 20 are superposed upon plate 19 and flanges 17k of plates'16, and bricks 21 paralleling bricks 10 are secured upon and project forward from bar 14 to increase the length of the upper part of the mouth of chamber 11, as shown in full lines Fig. l, and dotted lines Fig. 4f. Y

To supply hot-air to the chamber 11 where its temperature will be raised preliminary to its forcible ejection onto the fuel as herein- Vbefore explained, I provide two inclined series of air pipes 22. Each series of said pipes collectively slope downward and laterally inward and individually slope downward and forward and said pipes communicate at their front ends with the enlargements of chamber 11 and at their rear ends extend ythrough sleeves 23 in the rear wall .of the furnace, the pipes being supported at their intermediate points by brick or equivalent piers 2-1. The sleeves 23 are slitat their ends at 25 to produce lips 26 which are bent i `inner faces of said rear wall.

upwardly andV bear against the outer and The rear Y ends of pipes 22 project'slightly beyond the p rear. ends of the sleeves and are slit jtoproduce lips 27 bent outwardly against the rear ends of the Vsleeves to guard against any possibility of the pipes sliding forward. After the parts are thusarranged the rear ends of the spaces between the pipes and sleeves are plugged with clay 28, or its equivalent, torpreventair passing into the furnace through the f rear wall except through pipes 22, whichclay'can be readily dislodged should-it'be found necessary to Vwithdraw one Vof the pipes 22 fromposition and replace it by another. Fitting in the rear end of such pipe'22 is a tubular plug 29 provided with a pivoted valve or closure plate 30 so that the pipes may bev separately wholly or partiallyclosed.

Referring now to Figs. Sand 9, Vit willbe Y seen that the rear; portion of the bridgebeing adapted to be secured in the rear wall of the furnace in any suitable manner but preferably as explained in connection with -the rear ends of pipes 22, though the re4- placement vof pipes 84 will not be necessary as frequently as the replacement of pipes Y 22 because the latter are in the more Vdirect path of the ila-mes whichv pass up over the bridge-wall and under the boiler tothe rear end ofthe same. Y

To intensify the combustion in the combustion chamber a blast of hot air, which` enters from the rear end of the furnace, is

heated by pipes 22 and is discharged over y the grate 5, through the downwardly and forwardly inclined mouth of chamber 11,

and in this connection it should beV statedY that the mouth of said passage is above the plane of anyfuel thatmay accumulate upon the grate and therefore cannot be clogged orclosed by such fuel, the forward inclination of the mouth guarding against any possibility of fuel remaining in it 'thatmight possibly be projected therein by a sufficiently powerful thrustof` the poker or other device against the fuel.

It will also be .apparent that bustion can be maintained` in the extreme rear of the furnace becauseV of the fact that the hot air of chamber 11 -is Y discharged down upon the grate. It will also'be-ob-H served byrreference particularly to'Figsjl a fierce com- "rasante and 2, that the construction and arrangement-of the upper part of the bridge wall and of the series` of air supply pipes 22 is such as'to pi ovide a passage which tapers substantially uniformly from the bridge wall to the rear end ofthe boiler-,such passage being of substantially inverted-arc shape so as .to -correspond approximately to the curvature of the lower side of the boiler in order that the lower part of the latter shall be as effectively subjected to the action ofthe flames as the side portions. The arrangement of the pipes 22 is such that any one of them may be quickly and easily removed at any7 time without the removal or disturbance ofa brick, as the sleeves 23 are of sufficient length to permit said pipes to be readily centered with respect tothe holes provided for theirreceptioii in the rear part of the bridge wall.

ln the modified constructions shown in Figs. 8 to 10 inclusive, air is heated in pipes 3l and additionally heated iii chamber 32 and is discharged forwardly into the ash pit, below grate 5', part of such air .passing upvwa'rdly through 'and forwardly over the `grate and cooperating with the blast of air from the mouth of chamber 11 to effect complete consumption ol the fuel upon said grate 5, itbeiiig also understood 'that the clinlrers on the grate and in the ash pit are kept alive for a time by the air which passes forwardly from chamber 32 to effect the extraction of all ofthe heat units and thus tend to the economical Voperation of the furnace as a whole. As-pipes are elongated by' expansion the collars 85 approach and close the openings through which the Vpipesl extend into chamber 32. ln Fig. 10, recess 32 is formed by an inclosure 36, which may be of any suitable material whereas, in Fig. S, this recess is formed by the brick work or masonry 31, in the manner previously described. ]n any case, however, the recess 32 cooperates with the, previously" described mouth in the bridge wall topromote combustion by supplyingheated air to thefuel on the grate. i i

I do not limit myself to the exact construction shown and described.

Having thus described the invention what l claim as new and desire to secure by Letters-Patent, is:

l. A furnace provided with a boiler, aV

grate underlying the boiler, a bridge wall also underlying the boiler at the rear end of the grate and provided with a chamberhaving an inclined mouth to discharge air downward and forward upon the fuel on the grate, sleeves extending downwardly and forwardly through the rear wall of the furnace and provided at their opposite ends with outwardly projecting lips engaging the inner and outer faces of said wall, pipes extending through said sleeves and communi- `eating at their front ends with the `said inner and outer faces of said wall, pipes extending through said sleeves and communieating at their front ends with the said chamber of the bridge wall, and lugs pro- `jecting laterally outward from the rear ends of said pipes engaging the rear ends of said Asleeves to prevent forward movement or ere'epage of the former.

' 3. A furnace provided with a boiler, a grate underlying the boiler, a bridge wall also underlying the boiler at the rear end 'of the' grate and provided with a chamber vhaving an inclined mouth to discharge air downward and forward upon the fuel on the grate, and a throat which expands inwardly from its opposite sides toward its `m'id'dle to concentrate the major portion of `the volume of air centrally of the mouth. Vand two series of pipes extending through the rear wall of the furnace and communieating at their front ends with the chamber of the 'bridge wall near its opposite ends.

4. A furnace provided with a boiler, a gif-ate underlying the boiler, a bridge wall also underlying the boiler at the rear end of the grate and provided with a chamber having an inclined mouth to discharge air downward and forwardupon the fuel on the grate; and a throat which expands inward from its opposite sides toward its middle to concentrate the major portion of the 4volume of air centrally of the mouth, and two series of pipes extending through the rear'wall of thefurnace and communieating at their front ends with the chamber of the bridge wall near its opposite ends, the pipes of each series collectively sloping downward and inward and individually downward and forward.

5. A furnace provided with a boiler, a grate underlying the boiler, a bridge wall also underlying thevboiler at the rear end of the grate and provided with a transverse chamber of greater cubical capacity at its ends than at its middle; said chamber having a downwardly and forwardly sloping mouth, said mouth extending straight across from one side of the grate to the other, and two series of pipes extending transversely of the bridge wall, communicating at their front ends with the enlarged ends.

ber having a downwardly and forwardly sloping mouth, and a throat which expands inwardly from each end to direct the major portion of the volume of air through the central portion of said mouth, and two series of pipes communicating at their front ends with the enlarged ends of the chamber and with the atmosphere at their rear ends.

7. In a furnace, a bridge wall providedV with a chamber therein, air pipes disposed back of said bridge wall, said pipes being exposed to the heat of combustion and arranged to supply heated air to said chamber, and means at the other ends of said pipes for, regulating or controlling the influx of free air, said pipes being dependent for such niiux upon the draft of the furnace, said pipes being arranged in two separated groups, one group at each side of the furnace,.the top of each group sloping down ward and inward, eachr pipe being straight from end to end, and Lthe bridge wall being higher at each side than in the .center thereof.

y 8. In a furnace, a bridge wall provided with a chamber therein, air pipes disposed back of said bridge wall, said pipes being exposed to the heat of combustion and arranged to supply heated air to said chamber, and means at the other ends of said pipes for regulating or controlling the influx of free air, said pipes being dependent for such influx upon the draft of the furnace, said chamber having a mouth for delivering the heated air downward upon the burning fuel, and a throat governing the delivery of air from said chamber to the said mouth, which throatvisrhighest at the middle and low at the ends thereof. y

9. A furnace provided with a boiler, a grate underlying the boiler, a bridge wall also underlying the boiler at the rear'end of the grate and'provided with a chamber `having an inclined mouth to discharge air downward and forward upon the fuel on the grate, and a throat which expandsV inwardly from its opposite sides toward-its middle to concentrate the major portion of the volume of air centrally of the mouth, and two series of pipes extending through the rear wall of the furnace and communicating at their front ends with the chamber of the bridge wall near its opposite ends, said chamber having a plate forming a backwall for supporting the ends of said pipes, a

recess behind said plate to discharge heated air below the grate, and air heating pipes leading to said recess from the atmosphere.

10. A furnace provided with a boiler, a grate underlying the boiler, a Vbridge wall also underlying the boiler at the rear end of the grate and provided with a transverse chamber of greater cubical capacity at its ends than at its middle; said chamber having a downwardly and forwardly Ysloping mouth, said mouth extending straight across from one side of the grate to the other, and two series of pipes extending transversely of the bridge wall, communicating at their front ends with the enlarged ends of the chamber and with the atmosphere at their rear ends, said chamber having a plate forming a back wall for supporting the ends of said pipes, a recess behind said plate to d ischarge heated air below the grate, and air heating pipes leading to said recess from the atmosphere.

In testimony whereof I aiiix my signature, in the presence of two witnesses.

Y EDWARD LANE.

l/Vitnesses: Y

WM. A. STEINMEYER, VE. J. lB/JVCGREGOR.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C.4 

